发明名称 |
CONTROL CIRCUIT WITH BURST MODE AND EXTENDED VALLEY SWITCHING FOR QUASI-RESONANT POWER CONVERTER |
摘要 |
A control circuit for power converter according to the present invention comprises a PWM circuit generating a switching signal coupled to switch a transformer of the power converter. A feedback input circuit is coupled to an output of the power converter for generating a feedback signal. The feedback signal is coupled to turn off the switching signal. A detection circuit is coupled to the transformer for generating a valley signal in response to a waveform of the transformer. A frequency-variation circuit is coupled to receive the feedback signal and the valley signal for generating a frequency-variation signal. The frequency-variation signal is coupled to turn on the switching signal. A burst circuit is coupled to receive the feedback signal for generating a burst signal to disable the switching signal.
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申请公布号 |
US2012069608(A1) |
申请公布日期 |
2012.03.22 |
申请号 |
US201113182839 |
申请日期 |
2011.07.14 |
申请人 |
YANG TA-YUNG;CHEN JUNG-SHENG;LI CHUH-CHING;HSIEH CHIH-HSIEN |
发明人 |
YANG TA-YUNG;CHEN JUNG-SHENG;LI CHUH-CHING;HSIEH CHIH-HSIEN |
分类号 |
H02M3/335 |
主分类号 |
H02M3/335 |
代理机构 |
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主权项 |
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地址 |
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